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Ratio and proportion year 9

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• Apply understanding of the relationship between ratio and proportion; simplify ratios, including those expressed in different units, recognising links with fraction notation; divide a quantity into two or more parts in a given ratio; use the unitary method to solve simple problems involving ratio and direct proportion

Most

• Use accurate notation, including correct syntax when using ICT
• Apply routine algorithms
• Use proportional reasoning to solve problems, choosing the correct numbers to take as 100%, or as a whole; compare two ratios; interpret and use ratio in a range of contexts

Some

• Understand and use proportionality and calculate the result of any proportional change using multiplicative methods
• Calculate an original amount when given the transformed amount after a percentage change; use calculators for reverse percentage calculations by doing an appropriate division
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